http://www.networkworld.com/news/2012/032612-akamai-ipv6-257634
Carrying between 20% and 30% of the Internet's Web traffic on any given day,
Akamai is the world's largest content delivery network (CDN). Akamai's
engineering team has been working for two years to upgrade its 95,000
servers in 71 countries connected by 1,900 networks to support IPv6.